Zinc perborate.



UNITED sTA'rEs PAT NT OFFICE.

orro LIEBKNECHT, or 'FRANKFoRr-oN-rnE-MMN, GERMANY, 'ASSIGNOR TO THEROESSLER & HASSLAGHER OHElVlICAL COMPANY, OF NEWV YORK, N. Y., ACORPORATION OF NEW YORK.

To all whom it may concern:

Be it known that I, OTTO LIEBKNECHT, a

- subject of the German Emperor, and a resident ofFrankfort-on-the-Main, Germany,

have inventeda certain new and useful Composition of Matter, of whichthe following is a specification.

ention relates to the production of zinc 'i'erborate as a new and-usefulcomposition"of"1r'1atter. The process for producing thelsam'e an'd'theorder. of steps in causing the reactions of said rocess may be variedand term-n part 0ft s invention, the essential feature thereofbeing theproduction of zinc rbbrate-as a new composition of matter.

1 I shall describe the process I prefer for producing 'zincperborate,first stating the same generallmto'gether'with some variations of theysame, and then giving a specific example. Thegprocess'I'm-efer comprisesgenerallythe' causin *ofan alkali peroxid, such as sodiumgiboracicjacid, and either zinc sulfate or mine clilorid' to react Withone another.

The oracic acid may-be stirred into a solution of sulfate or zinechlorid and While the solution iiabeingagitated the alkaliperoxid isadddflhe" solution, if necessary, being cooled duri'l'rgthefaddition ofthealkali eroxid, or the V ocessma'ybe varied by adding the al water,the solution being ool during the addition, then. addinga Help soo'fzinc sulfate or zinc chloridjand fi n stirring the boracic acid. Inat use the resulting compound should be fil washed with water, dried,and the pulverizedmaterial 'decanted witlrwater'nntil all of thesulfate, chlorid, or

' othersalt of the alkali Iperoxid used is in s0- luti om'f' Anothervariation in the process m y becarried out by rubbing sodium perb'omite'a nd zinc sulfate or zinc chlorid togethe'r with water, whereby achange takes place into zinc perborate, and'a sodium-salt or t'sodiumperbor'atesolution may be decomposedfby'a mineral acid into the sodiumIlltbfthe mineral-acid and erboracic acid bl ita 'equiv'alent boracicaei and hydrogen Tp this is added a solution of zinc crime chlorid, zincperborate pre- Specification of Letters Patent.

Application filea'rebmm 17,1905. Serial No. 2%.070.

r dred parts of Water.

ZINC PERBOBATE.

Patented. July 3, 1906.

' cipi tating while stirringwith a not too highlyconcentratedsoda-caustic solution. Another varlati on may be performed by rubbing afreshly-prepared moist zinc peroxid hydrate together withfinely-pulverized boracic acid, thus obtaining a thin paste of zincperborate.

The following example ,will more clearly illustrate the general process:Two hundred and eighty-seven parts of zinc sulfate (ZnSO 7Aq) aredissolved in about six hun- Then while stirring the mixture sixty-twoarts of finely-pulverized boracic, acid are ad ed and then eighty partsof sodium peroxid, (ninety-seven per cent.,)

. the mixture being cooled and stirred vehemently, preferably with ascrew stirrer, during the addition of'the sodium. peroxid. The resultingcompound is stirred for about onehalf an hour and then allowed to coolto 5 to 10 centi grade. It is then filtered oif,-washed with water, anddried, first in the air and then in a vacuum-closet, the pulverizedsubstance being decanted Wit-h.water until all the sodium sulfate is insolution.

The zinc perbo'rate resulting from-the examplegiven above is a whiteamorphous ioose powder, especially useful for dermatological purposesand contains a decidedly higheramount of'oxygen than zinc oxid, theyield of oxygen being not far from the theo retical. l

I There are a series of perborates coming -within the scope of theinvention. For in- The perbo rate results from the above example .mostnearly approximates the thirdformula but by varying the pr'opor-.

tions of the raw materials mixtures responding to all three formulas canbe obtained. I therefore do not restrict myself to any particularformula. i

Having described my invention, what I Correction in Letters Paten't'No.82 4,798.

.claim, and desire to secure by Letters Patent my name in the presenceof two subscribing of the United States, is v wltnesses. As a,composition of matter, ZlIlC perboTate in the form of a White,amorphous, loosle OTTQ LIEBKNECHT 5 powder containing more oxygen thanzine Witnesses: v v

oxid. V 'Hons r ZLEGLER, In witness whereof I have hereunto signed 3CARL GRUND.

It is hereby certified that in Letters Patent No. 824,798, grented July3, 1906, upon the application of OttoLiebknecht, ofFrankfort-on-the-Maih, Germany, for en improvement in Zinc Perborates,en error occurs in the printed specification requiring correetiomesfollows: In line Z6, page 1, the word ioose. should read loose; and thatthe said Letters Patent should be read with'this correction therein thatthe same may conform to the record of the case izithe Patent Ofiice.

' Signed and eealed this 24th day of July, A. D., 1906.

' [sm;..] e F. I. ALLEN,

Commissioner of Patents.

Correction in Letters Paten't'No. 82 4,798.

.claim, and desire to secure by Letters Patent my name in the presenceof two subscribing of the United States, is v wltnesses. As a,composition of matter, ZlIlC perboTate in the form of a White,amorphous, loosle OTTQ LIEBKNECHT' 5 powder containing more oxygen thanzine Witnesses: v v

oxid. V 'Hons r ZLEGLER, In witness whereof I have hereunto signed 3CARL GRUND.

It is hereby certified that in Letters Patent No. 824,798, grented July3, 1906, upon the application of OttoLiebknecht, ofFrankfort-on-the-Maih, Germany, for en improvement in Zinc Perborates,en error occurs in the printed specification requiring correetiomesfollows: In line Z6, page 1, the word ioose. should read loose; and thatthe said Letters Patent should be read with'this correction therein thatthe same may conform to the record of the case izithe Patent Ofiice.

' Signed and eealed this 24th day of July, A. D., 1906.

' [sm;..] e F. I. ALLEN,

Commissioner of Patents.

It is hereby certified that in Letters Patent No. 824,798, granted July3, 1906, upon the application of Otto Liebknecht, ofFrankfort-on-the-Main, Germany, for an iniprovement in Zinc Perboretes,an error occurs in the printed specification requiring correction, asfollows: In line Z6, page 1, the word ioose should read loose; and thatthe said Letters Patent should be read with this correction therein thatthe same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 24th day of July, A. 1)., 1906.

[Emmy F. 1. ALLEN,

Commissioner of Patenta.

